html,
body {
	width: 100%;
	height: 100%;
}

* {
	margin: 0;
	padding: 0;
}

a {
	color: #000000;
	font-weight: Normal;
	/*CSS字体效果 普通 可以改成bold粗体 如果去除此行那么默认是不显示下划线的*/
	text-decoration: none;
	/*CSS下划线效果：无下划线*/
}

a:hover {
	/*CSS下划线效果：无下划线*/
	text-decoration: none;
}



/* 页面整体 */
#main {
	position: relative;
	width: 100%;
	height: 100%;
	background-image: url(../img/bgc.jpg);
	background-size: cover;
}

/* 登录框 */
#login {
	color: #fff;
	width: 300px;
	height: 200px;
	margin: 0 auto;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	background-color: rgba(20, 20, 20, 0.342);
	padding: 20px;
	border-radius: 20px;
	box-shadow: 20px 20px 30px rgba(235, 227, 227, 0.685);
}

/* 密码框 */
#password {
	position: relative;
	left: 15px;
}

/* 登录标题 */
#login h2 {
	text-align: center;
	margin-bottom: 20px;
}

/* 密码框和用户名 */
.username,
.password {
	padding-left: 20px;
}

#username,
#password {
	height: 30px;
	margin-bottom: 20px;
	outline: none;
}

/* 按钮 */
.btn_box {
	width: 200px;
	overflow: hidden;
	margin: 0 auto;
}

.dl_btn {
	border-radius: 10px;
	float: left;
	width: 50px;
	height: 40px;
	background-color: rgba(255, 255, 255, 0.514);
}

.zc_btn {
	border-radius: 10px;
	width: 50px;
	height: 40px;
	float: right;
	background-color: rgba(255, 255, 255, 0.514);
}
